A method for quickly changing tool strings and wellheads in conjunction with bridge plug perforation under pressure

Abstract

A method for rapid replacement of tool strings and wellheads in combination with bridge plug perforation. The plug-in wellhead device is connected between the wellhead and the cable lubricator, and the female connector can be connected to the male through the hydraulic control system. The locking and unlocking action of the connector; through the remote control of the hydraulic control system, the automatic connection and disengagement of the cable lubricator and the wellhead are realized; Take off the tool string in the vertical state and change it. The invention does not require workers to manually change the wellhead, and does not need to consume a lot of manpower to drag the tool string from the cable blowout pipe, which can reduce the number of operators by at least 3-4, and it is simpler and easier to change the wellhead and tool string. The invention directly realizes the automatic refitting of the cable blowout preventer wellhead through remote hydraulic control, avoids the link of inverting and erecting the cable blowout preventer, and speeds up the refitting of the wellhead and tool string by at least 50% compared with the original method, which is more efficient.

Description

technical field [0001] The invention relates to the field of perforation and well completion, in particular to a method for quickly changing tool strings and wellheads in conjunction with bridge plug perforation under pressure. Background technique [0002] Large-scale staged fracturing technology is a key technology for the development of low-porosity and low-permeability unconventional oil and gas resources such as shale gas and tight oil and gas, and the combined technology of bridge plug and perforation under pressure is an important part of it. Under pressure bridge plug perforation joint operation means that under the premise of effective communication between the wellbore and the formation, the bridge plug and perforation tool string are transported to the downhole target layer through hydraulic pumping by means of cable transmission, and the bridge plug setting and perforation are completed. Multi-cluster perforation realizes downhole stratum segmentation and forms c...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the time-consuming and labor-intensive process of the existing pressurized bridge plug perforation combined tool string and wellhead replacement process, and also involve high-altitude, high-pressure operation risks, the purpose of the present invention is to provide a pressurized bridge plug perforation. The method of quickly changing tool strings and wellheads with hole joints helps to reduce the construction strength of bridge plug perforation joint operations under pressure, enhance the construction safety of bridge plug perforation joint operations under pressure, and improve the pressure of bridge plug perforation joint operations. Construction time limit

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